Cap for a fitting



FIG. 1 is a side view of a cap for a fitting showing my new design;

FIG. 2 is a top view thereof;

FIG. 3 is a bottom view thereof; and,

FIG. 4 is a side view of the cap located on a fitting retained in a housing.

The fitting and housing shown by dashed lines in FIG. 4 are included to illustrate an associated environment and form no part of the claimed invention. 

The ornamental design for a cap for a fitting, as shown and described. 